• Husqvarna Motorcycles Made In Sweden - About 1988 and older

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1984 250 WR-XC-CR Air or H2O Cooled Porting Specs

1982 XC 430

1982 XC 430

Husqvarna
AA Class
Hello, Ever since I got my 82 250 Xc I have been told that the 84 Cylinder is the one to have. I have the Info on the Factory Porting Specs that were released back in the Day. So a buddy has a 84 WR Project Bike that is more Project than Bike. Ok so here is my Question. Was the Porting the same on the Air Cooled and the Liquid Cooled Cylinders? WR and CR? Or if they are diffrent is there any reason that the Air Cooled WR can't be Ported into a CR Spec Cylinder? Thanx...
 
The 84 CR250 water cooled porting is different , less bottom end power , different pipe and carb . I say just clean up cylinder porting he has on his WR 250
 
So it probably is what I exspected, the 84 Air Cooled is just left over 83 Parts. The WR Bikes never got respect they deserved.....
 
WR250 84 bikes are worth more than a CR as there are classes to ride that bike and easy to fix and modify and great in the woods
 
I concentrated more on the 430 and 500 but have examined some 250 stuff so verify what I say I am too lazy today to find my parst cd and look up 82 and 84 and often they don't change the picture just the part #
The 1982 has the two seperate little reed cages and the 83 and on has the bigger four pedal in a line one doesn't it? When you go to the water cooling the exhaust comes out the front of the cylinder and the curve is in the pipe. The air cooled one the actual hole in the cylinder is in the center but the pipe attaches to the side of the frame tube. I would imagine the water cooled ones in the 250 would have a web inside the transfers on the sides to help direct flow. I had an 88 top end, not the power valve one I sold off but I recall the back of the piston had a semi circular cut out on the skirt at the bottom on the intake side and the start of connecting the side transfer ports to the reed cage cavity. The beginning of evolution to what the modern stuff looks like. At some point in the liquid cooled bikes of this section the bore/stroke was changed for a longer stroke and less bore so make sure which liquid porting specs you are dealing with if you get that kind of data.
 
I have an 84 250WR that I had bored about a year and a half ago but haven't assembled because the frame is not ready to get painted. I do have to say that the ports in it looked cavernous so I have no idea if they are stock WR. For all I know the original owner either ported it or replaced with an XC or CR cylinder. The ports in my 82 430WR cylinder look very small by comparision. The (2) 82 250WR cylinders I have look about the same as the 84 cylnder.
 
DSC_4721.JPGDSC_4722.JPGDSC_4725.JPG DSC_4721.JPGDSC_4722.JPGDSC_4725.JPG I got around to working on my 84 250 Wr a bit today I Split and redid the crank. Started cleaning Parts and got to looking at the cylinder and agree on the Cavenous Ports part. My 82 250 I have yet to see the Cylinder yet but compared to any other two stroke I have done they are large and many. Didn't exspect the Extra Ports in the Exhaust and Transfer. Also wondered about the Extra ports that lead from the Reed direct to the Tranfers. Sombody has been in there cleaning things up ahead of me but if I didn't still see some Casting marks left in all the Extra ports I'd think somebody had had a wild port job done on it.
 
I jumped over to the Tech-manual side of this site and found the 1984 Factory Porting Specs for the 250 Cr. From what I see there isn't any visable diffrence in the Transfer or Intack Ports between the CR and WR. As there is no referance to the Exhaust there is no way to compare. of Coarse we know the H2o Cylinders have the Exhaust in the middle.
 
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